Paper-making apparatus



May 24. 1927.

H. G. CRAM PAPER MAKING APPARATUS I Filed Jan. 15, 1926 2 H/h I a w a a v pass through the calenders or collect be- Patented May 24, 1927.

UNITED STATES l,629,68l PATENT OFFICE} o HERVEY G. CRAM, 0F MILLINOCKET, MAINE, ASSIGNOR To GREAT NORTHERN PAPER COMPANY, OF MILLINOCKET, MAINE, A CORPORATION OF MAINE.

PAPER-MAKING APPARATUS.

Application filed January 15, 1926. Serial No.'81,533.

This invention relates to paper making and has particular reference to'means for guiding the paper through the calenders of machines running at moderate paper speed, although not necessarily restricted to such type of machine.

On fast running machines, the general practice now is to carry the paper through the calenders by means of the invention patented by Charles E. Pope, No. 1,326,615, dated December 30, 1919.

The Pope invention consists of the use of air blasts in combination with doctors for scraping the paper from an upper calender and carrying it to the next lower calender. When it is possible to avoid the use of doctors it is desirable to do so as they involve substantial initial expense and material expenditure of power. For these and other reasons the present practice is to carry the paper through the calenders by hand on slow running machines although the practice is very dangerous to the fingers and arms of the operative.

It is an object of this invention to provide means to pass the paper through the calenders which obviates the necessity for doctors; and the combination of air blasts and guides of the construction and arrangement' which comprises a further object of this invention is suitable for many machines.

In paper making, the paper may come throughthe calenders in folded masses after a break or at the start and must be given an unobstructed downward passage so as to prevent clogging; and the paper must be stripped from each upper calender and made to pass around the next lower calender. In practicing my air blasts to remove the paper from the upper calenders and guides which receive and control air blasts so that the paper is led downwardly and about the lower calenders. The guides are relatively widely.

spaced from the calenders' so that there is an unobstructed downward passage for any large folded masses of the paper which may tween guides and calenders, and I provide air blasts to force the paper to move downward through the guides.

A further object of this invention is generally to improve the art of paper makmgvide an air blast 22 to st-ri invention I provide Fig. 1 is a diagrammatic side elevation of the calender stack and the end driers of a paper making machine embodying the 111 ventlon.

Fig. 2 is an enlarged perspective detail of a portion of the calender rolls and illustrating more clearly the manner of applying the air blasts and guides.

My invention is here shown as applied to the vertical stack of calender rolls 10 of a paper making machine. The dry paper sheet 12 is adapted to pass from the drier rolls 14 into the bight of two superimposed calender rolls at the upper end of the stack and thence is passed downwardly successively between the lower rolls by means of my invention; and the calendered paper sheet passes from the lower end of the stack to a reel 16. The usual doctors 18 and 20, as shown in the above Pope patent, may be disposed at the'lowermost and the next upper calender to scrape off the paper, should it adhere thereto, and assist it inpassing to the reel.

At the start of paper making a narrow paper-strip, called a lead stri is first threaded through the machine and when the lead strip is passing through in a satisfactory manner the strip is broadened out to't'he full width of the paper sheet.

In accordance withthis invention, I prothe lead strip from an upper roll and. e-flect it downwardly and I provide guiding means including a guide plate 24 to cause the strip to pass downwardly about the lower roll and into the bight between said roll and the next lower roll. The lead strip may come through the calende-rs in large folded masses and must be permitted unrestricted movement downward through the guide plates and the calender rolls to prevent clogging, which will seriously interfere with the oper-, ation of th machine. Cinsequently, I provide air blasts 26 which are directed downwardly to force the paperdownward through the passages between the guide plate and the calenders; and these latter air blasts also serve in cooperation with the plates 24 to guide the paper to pass into the bight of the calenders. v

Said; air blasts are provided by air pipes 28 which are arranged in spaced relation and approximately parallel with the calenders adjacent the ights thereof and on the side of paper emergence from between the bights, or on alternate sides of the track. Since the lead strip only is to beoonducted through-the calenders the guide-plates and. the air blasts need not extend across the entire length of the calenders but only for a.

distance preferably somewhat greater than the width of the lead strip; and the air blasts and guide-plates are located at that end of the calender stack traversed by the lead strip.

Said air pipes 28 are provided with a lineal series of passages or orifices 30 through which air flows under suitable pressure to form the air blasts 22. Said orificesare disposed to direct said air blasts approximately horizontally against the lower portion of the calenders in a direction op posed to the motion of the calenders and against and under the edge of the lead strip should it adhere to an upper calender after having and direct it downwardly. the inclination of the air blasts and the surface of the calender at the point of impingement being such as to effect such directional movement. The paper is thus caused topass downwardly in the passage formed between the guideplate 24 and the calendar roll,

The guide-plates may be suitably supported in the position shown in any suit-.-

able manner as by being attached at their upper ends to the air pipes 28. The guide plates are disposed opposite the bights of of said plates are curved about the calender whereby,

rolls and approach said rolls more closely than the upper portions of the plates in cooperation with the air from the pipes 26. to guide the end of the lead strip effectively to enter the bights of the adjacent lower rolls. Preferably said plates are flexible to yield under pressure of large masses of paper passing downwardly between them and the rolls. wherebyto widen the passages and permit the paper to move freely downwardly therethrough.

Said air blasts 26 issue from a second set of passages or orifices 32'formed in the walls of the air pipes 28 and said air blasts are directed approximatelv horizontally downward in the passages tween the calender rolls and the guide plates and at acute angles passed through the bight, whereby; to detach. the lead strip from the calender.

of the plates, and

positively to force it downward through the passages between the guide plates and ealen-' dersan'd into the lower b-ights, thereby pre- I claim: 1. The combination of the calenders of a venting clogging of the calenders.

'paper making machine, means to provide an air blast to detach the paper from an upper roll to which it maybe adherent, a guide plate to guide the paper to move downwardly about a lower roll, and means to provide an air blast to move the paper forcibly through said guiding means. I 2. The combination of the calenders of a paper making machine, means to guide the paper downwardly between successive rolls including a guide-plate disposed in front of a roll and spaced therefrom to provide a passage between it and the roll through which the paper is adapted to move downward, and means to direct an air blast downwardly in said passage and against said guide plate. a f

3. The combination of the calenders of a paper making machine, means to guide the paper downwardly between successive rolls including a guide-platedisposed in front of a roll and extended from a point above the top of the roll to a point somewhat above the bottom of the roll, and spaced about the roll to provide a wide passage between it and the roll through which the paper is.

adapted to pass, and means to direct an air blast against an upper roll to detach therethereto and cause it to enter said passage.

-4. The combination of the calenders of a paper making machine, means to' guide the paperdownw-ardly between successive rolls including a guide-plate disposed in front of a roll andextended'from a point above the top'of the roll to a point somewhat above the bottom of the roll, and spaced about the roll to provide .a wide passage between it and the roll through which the paper is adapted to' pass, means to direct an air blast against an upper rollto detach therefrom the paper sheet. which may be adherent thereto and cause it to enter said passage, and means to direct an air blast downwardly in said passage 5. The combination of the calenders of paper making machine, means to guide the paper downwardly between successive rolls including a guide-plate disposed in front of a roll and extended from a point above the from the paper sheet which may be adherent I roll to provide top of the roll to' av point somewhat above the bottom of the roll, and spaced about the a wide passage between it and the roll through which the paper is adapted to pass, means to direct an air. blast against an upper roll to detach therefrom the paper entthereto and cause it to enter said passage,

. and means to direct an air the roll f rom*"a point end of said guide plate arranged to direct a direction to remove the. paper from an upper "roll and cause it toenter t-he'upper end to direct a second blast of air downwardly- I blast of 'air in a of the passage, and

in said passage and against the guide plate.

til

- viding a passage between 7. The combination of the calenders off apaper making machine and means to guide the paper downwardly between successive rolls, including a guide plate located-in front of a roll and opposite the and the next upper roll/and extended downwardly about the roll and terminated somewhatabove and adjacent the bight between the roll and the next lower roll, and prothe plate and the roll-whichis Wider at the top than at the the lower portion of the upper rection to detach the paper which may be I paper making l to direct a second airb the rolls, including a guide plate located in front 1 bottom, means to direct an air blast against roll in: a diadherent to that roll an cause it to enter the upper end of said astdownwardly in said passage. 7 I I 8. The combination of the calenders of a paper making machine and means to guide paper downwardly between successive of a roll and opposite the bight between it and the next upperroll, and'extendeddown wardly about the roll and terminated sometion to detach I passage and against -guide plate. I v 9, The combination of the calenders of a what above and adjacent ing a passage between the plate and the roll which is wider at the top'than'at the bottom,

lower-portion of the upper roll in a directhe paper which may be adherent to that roll and cause it'to enter the upper end of said passage, and means to direct a second air blast downwardly in said the inner face of said I paper making W rolls including an air sheet which may be adher- J to guide the from . also.

bight bet-ween it assage, and means the bight between the roll and the next lower roll, and provid-- and the other moving machinehind means to pass the paper downwardly between ".SIICCGSSIVG air blast onto the lower portion of that roll the roll, and also" having means to' direct a second =air blast downwardly in front of the next lower roll, and a guide-plate'-dis-,

posed in front of the lower roll and the second air blast. I

10. The combination of the calenders of a paper making machine and meansto pass the paper downwardly between successive rolls including an air pipe disposed in front of an upper roll having means to direct an air-blast onto the lower portion of that roll in a direction opposed to the movement of the roll, and also having means to direct a second air blast the next lower roll, and a guide plate attached to said air pipe and depending in frontof the lower roll and the second airv blast. 11. The combination of the calenders ofa paper making machine, and means to pass the 'paper downwardly rolls includingan air pipe disposed in front of an upper roll having means to direct an air blast onto the lower'portion of that roll in a direction opposed tothe movement .of the roll, and also "having means second air blast downwardly in front of the downwardly in front of to direct a pipe disposed in front of an upper roll having means to direct an between successive next lower roll, and a guide plate attached to said air pipe and depending in front of the lower roll and the second air blast and curved about the lower roll to provide a passage: down which'tlie paper is guided to the next lower roll. I I

12. The combination of the calendersof'a machine, of means to pass the paper downwardly between the successive rolls including a yielding guide-plate disposed in front of and adjacent a calender roll and means to direct a-n air blast downwardly in the passage formed between. said guide -plate-and the re 13. In a paper making machine,'guiding means for the paper including eans to provide two divergent blasts of air from approximately a common center disposed to strike the moving paper. ing in a direction opposed to the movement of the paper, and impinging against the P therefrom andpress it against the lower roll at approximately a right angle to said first mentioned blast and in the direction along which it is desired to pass the paper and between the paper and the guide. plate.

name to this specification.

HERVEY G. CBAM;

one of said et-s mov-' per roll and adapted to detach the paper 

